Continuity mistake: During the car chase scene near the end of the movie when Connors jumps on to the black car the windshield is only slightly lowered. Later during the chase the gap is much bigger and when we see Callahan struggling in the back seat it's lowered all the way down. Also, Connors grip on the car keeps changing between closeups and far off shots.
Factual error: In the beginning of the movie, we see one of the two journalists playing "The Game" in a Game Boy. The other journalist says that the game is available in cartridges and floppy disks. The problem is that the guy playing the game doesn't even has a cartridge inserted in the Game Boy. It's impossible to play ANY kind of game in a Game Boy, if the Game boy doesn't have a cartridge inserted in it.
Captain Thaddeus Harris: Not exactly a four star hotel, is it?
Lieutenant Talinsky: Well, we spend our police budget on fighting criminals, not on pampering out of town visitors.
Captain Thaddeus Harris: It was your government that brought us here.
Lieutenant Talinsky: They also bring in monkeys for zoo, but we don't put them in four star hotel either.
Trivia: Bubba Smith was originally going to reprise his role as Hightower. One day, Marion Ramsey called up Bubba in tears wondering why she wasn't asked to return as her character Hooks. Bubba already knew that Marion was having some financial difficulties and said he would see what he could do. He called up the producers and asked if she could be in the movie. When they said that Hooks couldn't be written into the script, Bubba refused to take part in the movie.